Results 91 to 100 of about 5,289 (173)

Do Neutron Star Ultraluminous X-Ray Sources Masquerade as Intermediate-mass Black Holes in Radio and X-Ray?

The Astrophysical Journal
Ultraluminous X-ray sources (ULXs) were once largely believed to be powered by super-Eddington accretion onto stellar-mass black holes, although in some rare cases, ULXs also serve as potential candidates for (sub-Eddington) intermediate-mass black holes.
Teresa Panurach, Kristen C. Dage, Ryan Urquhart, Richard M. Plotkin, Jeremiah D. Paul, Arash Bahramian, McKinley C. Brumback, Timothy J. Galvin, Isabella Molina, James C. A. Miller-Jones, Payaswini Saikia   +10 more
doaj   +1 more source

A New Sample of Dwarf Galaxies with X-Ray-selected Active Galactic Nucleus Candidates from the eROSITA All-Sky Survey

The Astrophysical Journal
To investigate the population of massive black holes in dwarf galaxies, we conduct a systematic search for active galactic nuclei (AGNs) using data from the first data release of the eROSITA All-Sky Survey (eRASS). We crossmatch dwarf galaxy positions in
John-Michael Eberhard, Amy E. Reines
doaj   +1 more source

Multiwavelength Observations of Ultraluminous X-Ray Sources [PDF]

Chinese Journal of Astronomy and Astrophysics, 2005
to appear in the Chinese Journal of Astronomy & ...
openaire   +2 more sources

A NuSTAR Study of Quasiperiodic Oscillations from the Ultraluminous X-Ray Sources in M82

The Astrophysical Journal
The study of quasiperiodic oscillations (QPOs) in X-ray binaries provides valuable insights into the physics of accretion around compact objects. The M82 galaxy hosts multiple ultraluminous X-ray sources, including two prominent ones—X-1 and X-2—where X ...
Hamza El Byad, Matteo Bachetti, Silvia Columbu, Giuseppe Rodriguez, Maura Pilia, Matthew J. Middleton, Dominic J. Walton, Murray Brightman, Hannah Earnshaw, Karl Forster, Brian Grefenstette, Felix Fürst, Marianne Heida, Matteo Imbrogno, Eleonora Veronica Lai, Thomas Maccarone   +15 more
doaj   +1 more source

Possible Supercritical Accretion on the Ultraluminous X-Ray Source in the Metal-poor Galaxy I Zw 18

The Astrophysical Journal
We present an analysis of X-ray observations of the ultraluminous X-ray source (ULX) in I Zw 18 based on archival data taken with Chandra, XMM-Newton, and Suzaku. This ULX is considered to be an intermediate-mass black hole candidate simply because it is
Marina Yoshimoto, Tomokage Yoneyama, Hirofumi Noda, Hirokazu Odaka, Hironori Matsumoto   +4 more
doaj   +1 more source

Modelling quantum aspects of disruption of a white dwarf star by a black hole. [PDF]

Sci Rep, 2021
Karpiuk T, Nikołajuk M, Gajda M, Brewczyk M.   +3 more
europepmc   +1 more source

On the contribution of ULXs to stellar feedback: an intermediate mass black hole candidate and the population of ULXs in the low-metallicity starburst galaxy ESO 338-4

, 2019
X-ray radiation from accreting compact objects is an important part of stellar feedback. The metal-poor galaxy ESO 338-4 has experienced vigorous starburst during the last 40 Myr and contains some of the most massive super star clusters in the nearby ...
Adamo, Angela, Bik, Arjan, Fuerst, Felix, Hayes, Matthew, Mas-Hesse, J. Miguel, Oestlin, Goeran, Oskinova, Lidia M., Oti-Floranes, Hector   +7 more
core   +1 more source

The Ultraluminous X-ray Sources NGC 1313 X-1 and X-2

, 2005
We present a detailed analysis of XMM archival data of two Ultraluminous X-ray Sources (ULXs) in the nearby spiral galaxy NGC 1313: NGC 1313 X-1 and X-2.
A. Treves, Cropper, Kaaret, King, L. Zampieri, M. Chieregato, Miller, Miller, Miller, P. Mucciarelli, R. Falomo, R. Turolla, Ryder, Schlegel, Strohmayer, Wilms, Zampieri   +16 more
core   +1 more source

A Phase-resolved View of Millihertz Quasiperiodic Oscillations in the Ultraluminous X-Ray Source M51 ULX-7: Evidence for a Magnetically Truncated Disk and Geometrical Beaming

The Astrophysical Journal
X-ray quasiperiodic oscillations (QPOs) are commonly observed in Galactic X-ray binaries and extragalactic ultraluminous X-ray sources (ULXs). In this study, we perform a phase-resolved analysis of recently discovered X-ray mHz QPOs in M51 ULX-7.
Qing-Cang Shui, Shu Zhang, Hua Feng, Yu-Peng Chen, Shuang-Nan Zhang, Jing-Qiang Peng   +5 more
doaj   +1 more source

Extragalactic Science with the Orbiting Astronomical Satellite Investigating Stellar Systems (OASIS) Observatory. [PDF]

Space Sci Rev, 2023
Aalto S, Battersby C, Chin G, Hunt LK, Rigopoulou D, Stark AA, Viti S, Walker CK.   +7 more
europepmc   +1 more source